#container::after {
  content: "";
  display: block;
  clear: both;
}
* {
  margin: 0px;
  padding: 0px;
}

#container {
  width: 1400px;
  margin: 0px auto;
}
/*页首*/
header {
  height: 50px;
  padding:20px 10px 10px 10px;
  border-bottom: 4px #000000  solid;
}

header a{
	text-decoration: none;
	color:black;
}

header a:hover {
  text-decoration: underline; /* 鼠标悬停时添加下划线 */
  color: blue; 
}

header div{
  float: right;
  font-family: "幼圆";
  font-weight: bold;
  margin-top: 16px;
}
/*logo图片*/
header img{
  float: left;
  width: 140px;
  height: 50px;
  margin-right: 60px;
  margin-top: 5px;
}

nav{
  float:left;
}

nav ul li{
  list-style-type: none;
  float: left;
  height: 33px;
  line-height: 50px;
  margin: 0px 55px;
}

ul li a{
  text-decoration: none; /* 默认没有下划线 */
  color: black; 
  font-family: "幼圆";
  font-size: 18px;
  font-weight: bold;
}

ul li a:hover {
  text-decoration: underline; /* 鼠标悬停时添加下划线 */
  color: blue; /* 可以设置鼠标悬停时的文字颜色 */
}

/*注册内容*/
body {
    margin: 0;
    font-family: 微软雅黑, 黑体, 宋体, Arial, Helvetica, sans-serif;
}
.center {
    min-width: 900px;
    max-width: 1200px;
    margin: 0 auto;
}

.center img{
    width: 1150px;
	height: 400px;
}

#userimg{
	width: 100px;
	height: 100px;
}

.copyright{
    padding: 10px 10px;
    text-align: center;
    color: white;
    font-size: 14px;
}
fieldset{
	margin: 20px;
}
fieldset div{
	padding: 5px; margin: 5px;
}
/*输入框大小*/
input[type=text],input[type=password],input[type=email],input[type=number],input[type=date],select.normal_select{
	height: 40px;
}
button[type=submit]{
	background-color: #4caf50;
}
button[type=reset]{
	background-color: #e63837;
}
input[type=file]{
    width: 0; /* 实现控件“隐藏”，display:none会和required冲突 */
}
/* 用于替换文件上传控件外观的图片样式 */
img #userimg{
    max-width: 100px; 
    max-height: 140px; /* 自适应高宽 */
}

/* radio样式 */
input[type=radio] {
    padding: 100px;
    margin: 10px;
}
/* textarea样式 */
textarea{
    width: 97%;
    height: 200px;   /* 宽度和高度设置比HTML的cols和rows属性更准确 */
    resize: none;    /* 不允许浏览器提供用户修改文本框大小 */
}
/* button样式 */
.register_submit {
    text-align: center;  /* 按钮居中显示 */
}
button[type=submit] ,button[type=reset]{
    width: 200px;
    color: white;
    margin: 20px;
    padding: 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
/* 全局事件样式 */
input:hover, select:hover, textarea:hover,input:focus, select:focus, textarea:focus {
    border-color: #05a;
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(102, 175, 233, .6);
    outline: 0; /* 去除默认轮廓线条 */
}

button[type=submit]:hover {
    background-color: #45a049;
}
button[type=reset]:hover {
    background-color: #e03837;
}
input[type=text]:invalid, input[type=password]:invalid, input[type=email]:invalid,input[type=date]:invalid {
    border-color: lightblue;
}
input[type=text]:valid, input[type=password]:valid, input[type=email]:valid,input[type=date]:valid {
    border-color: green;
}
.jumbo_container {
    padding: 20px;
}
/* 页脚样式 */
footer {
  background-color: #333; /* 页脚背景颜色 */
  color: white; /* 文字颜色 */
  text-align: center; /* 文字居中 */
  margin-top: 50px;
}